I thought the Boris bus is an interesting concept with a rear platform and a slightly longer bus, they are quiet and smooth, I do have a couple of issues with it being the seat is too short for my legs and no open windows ventilation for hot days, I have heard the A/C can sometimes fail turning the bus into a sweat box.
If they can fix those issues, you would have an enduring iconic London bus on par with the old Routemasters, which also had teething troubles of their own when they were introduced.
There's talk of having trolleybus operation down Oxford Street by converting some of the Boris bus, nothing came of that propsal as I understand it BYD double decker all electric bus is being looked at.
I have to say overall, I like the Boris bus.